CN108150261A - A kind of DPF initiative regenerations temprature control method - Google Patents
A kind of DPF initiative regenerations temprature control method Download PDFInfo
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- CN108150261A CN108150261A CN201711428234.6A CN201711428234A CN108150261A CN 108150261 A CN108150261 A CN 108150261A CN 201711428234 A CN201711428234 A CN 201711428234A CN 108150261 A CN108150261 A CN 108150261A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
- F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
This application discloses a kind of DPF initiative regenerations temprature control method is proposed, this method includes：Obtain the temperature T at the DOC inletDOCUs, the upstream regeneration temperature desired value of the DPF is actively set as Tdes；Consider the TDOCUsWith the TdesTemperature difference, calculating makes temperature at the DOC outlet reach TdesWhen, need the amount of fuel that is added in the DOC；The fuel oil of corresponding amount is sprayed into the DOC inlet.Present application addresses the problem of conventional regeneration temperature scaling factor is unstable, and overshoot is excessive.
Description
Technical field
This application involves diesel engine post-processing system control method, especially a kind of DPF initiative regenerations temprature control method.
Background technology
Fig. 1 is typical dpf regeneration temprature control method, by DOC (diesel oxidation catalysts, in exhaust
HCs, CO are purified) downstream reload temperature sensor, DPF (diesel particulate filtration reactors, for particle in exhaust are measured in real time
Object PM is purified) upstream temperature, after ECU (car running computer) receives DPF upstream temperature information, with being stored on the DPF inside ECU
Trip regeneration temperature setting value is compared, and carries out closed-loop control.When monitoring that DPF upstream temperatures are less than setting value at this time, ECU
By calculating temperature difference, increase distributive value, improve DPF upstream temperatures to approach desired temperature；When monitor DPF upstream temperatures height
When setting value, distributive value is reduced, is close to desired temperature.
The above method is current main-stream dpf regeneration temperature scaling factor method, although simply, since temperature is relative to signal
It is very slow to transmit rate of change, and DOC upstreams regeneration nozzle distributive value is converted to heat by DOC and is also required to the time, therefore increase
After big distributive value or reduction distributive value, DPF upstream temperature sensors are not to monitor temperature rise or reduction at once, and ECU is still pressed
It is handled according to increasing or reducing distributive value, regeneration temperature control can be caused unstable, generate larger temperature overshoot.
Therefore, it is necessary to solve the problems, such as under such situation the unstable overshoot of traditional dpf regeneration temperature scaling factor.
Invention content
The purpose of the application is：A kind of DPF initiative regenerations temprature control method is proposed, to solve conventional regeneration temperature closed loop control
Make unstable, the problem of overshoot is excessive.
The technical solution of the application is：
A kind of DPF initiative regenerations temprature control method, the DPF are connected to the downstream of DOC, which is characterized in that this method
Including：
Obtain the temperature T at the DOC inletDOCUs, the upstream regeneration temperature desired value of the DPF is actively set as Tdes；
Consider the TDOCUsWith the TdesTemperature difference, calculating makes temperature at the DOC outlet reach TdesWhen, need
The amount of fuel to be added in the DOC；
The fuel oil of corresponding amount is sprayed into the DOC inlet.
The application based on the above technical solution, further includes following preferred embodiment：
Temperature at the DOC outlet is made to reach T in calculatingdesWhen, when needing the amount of fuel of addition in the DOC,
Consider the function of environment heat emission amount that transformation efficiency, fuel oil of the fuel oil in the DOC burn in the heat and DOC generated.
Temperature at the DOC outlet is made to reach T in calculatingdesWhen, when needing the amount of fuel of addition in the DOC,
The DOC is divided into the N number of DOC units being sequentially arranged along fuel oil direction of travel, N >=2；
First, it is assumed that temperature is T at the DOC outletdes, heat dissipation of each DOC units to environment is only considered, by the DOC
Exit is to the first outlet temperature for calculating each DOC units at the DOC inlet successively；
Then, the maximum fuel amount that each DOC units can burn is calculated, to pushing away successively at DOC outlet at DOC inlet
Calculate the second outlet temperature for adding in each DOC units after corresponding maximum fuel amount under present case to each DOC units；
If reckoning show that the second outlet temperature of x-th of DOC unit is equal with the first outlet temperature of x-th of DOC unit,
The 1st to x-th DOC unit maximum fuels amount is then added summation, institute respectively divided by after the fuel oil transfer efficiency of corresponding DOC units
Obtain and value is that temperature at the DOC outlet is made to reach TdesWhen, need the amount of fuel that is added in the DOC；
If calculating, the second outlet temperature for obtaining y-th of DOC unit is less than the first outlet temperature of y-th of DOC unit,
And the second outlet temperature of the y+1 DOC unit is more than the first outlet temperature of the y+1 DOC unit, then calculating makes the
The outlet temperature of y+1 DOC unit is equal to the first outlet temperature of the y+1 DOC unit, the y+1 DOC unit should burn
Then amount of fuel will answer non-combusted fuels amount to distinguish described in the 1st to n-th DOC unit maximum fuels amount, the y+1 DOC unit
Divided by summation is added after the fuel oil transfer efficiency of corresponding DOC units, obtained and value is to make temperature at the DOC outlet
Reach TdesWhen, need the amount of fuel that is added in the DOC.
N >=10.
Described N number of DOC units etc. point setting.
The advantages of the application is：The application is compensated for the control of current main-stream DPF initiative regenerations temperature and is led based on temperature closed loop
Control targe temperature is caused the drawbacks of larger overshoot occur.After regeneration triggering, model DOC is in real time according to DPF upstream destination thermometers
The regeneration distributive value for reaching this temperature is calculated, is directly sprayed by this distributive value, the last one cell of DOC outlets temperature is calculated by model
Degree reaches target temperature.It is excessive to avoid conventional temperature closed-loop control overshoot, causes regeneration temperature is excessively high to burn DPF or regeneration temperature
Spend it is low cause regeneration interrupt, the recovery time it is long increase oil consumption the problem of.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the application will become in the description from combination accompanying drawings below to embodiment
Significantly and it is readily appreciated that, wherein：
Fig. 1 is existing typical case's DPF initiative regeneration temprature control methods；
Fig. 2 is the DOC internal air temperature traces only considered under each DOC units heat dispersal situations；
Fig. 3 is the DOC internal air temperature traces considered under each DOC units maximum fuel conversion capability；
Fig. 4 is the DOC internal air temperature traces considered under each practical fuel oil transformation efficiency of DOC units.
Specific embodiment
It is below in conjunction with the accompanying drawings and specific real in order to be more clearly understood that the above-mentioned purpose of the application, feature and advantage
Mode is applied the application is further described in detail.It should be understood that these embodiments are not limited to for illustrating the application
Limit scope of the present application.The implementation condition used in embodiment can do further adjustment according to the condition of specific producer, not
Dated implementation condition is usually the condition in routine experiment.Many details are elaborated in the following description in order to fill
Sub-argument solution the application, still, the application can also be implemented using other different from other modes described here, therefore, this
The protection domain of application is not limited by following public specific embodiment.
In the description of this specification, term " connection ", " installation ", " fixation " etc. should all be interpreted broadly.For example, " even
Connect " it can make to be fixedly connected or be detachably connected or be integrally connected；It can make to be connected directly or pass through
Intermediate media are indirectly connected.For the ordinary skill in the art, it can understand that above-mentioned term exists according to specific situation
Concrete meaning in the application.
In the description of this specification, the orientation or position relationship of the instructions such as term " on ", " under " are based on shown in attached drawing
Orientation or position relationship, be for only for ease of description the application and simplify description rather than instruction or imply signified device
Or unit must have specific direction, with specific azimuth configuration and operation, it is thus impossible to be interpreted as the limit to the application
System.
In the present embodiment, as traditional structure, DPF2 is also connected to DOC1 downstreams, i.e. DPF2 is connected in the outlet of DOC1
End.The present embodiment is as follows for the initiative regeneration temprature control method of the DPF：
The temperature T of (namely DOC upstream end) is obtained by temperature sensor at DOC inletDOCUs, it is assumed that the upstream of DPF
Regeneration temperature desired value is set to Tdes, that is to say, that temperature is T at DOC inletDOCUsIn the case of, it is launched into DOC
How many amount of fuel just can allow the regeneration temperature of DPF upstream ends to reach Tdes.Downstream namely the DOC of DOC are connected in view of DPF
The port of export, then when the regeneration temperature of DPF upstream ends reaches TdesWhen, the temperature also approximate (difference is minimum) at DOC outlet is
Tdes。
1st, with reference to shown in Fig. 2, DOC etc. is divided into along the fuel oil direction of travel (side in Fig. 2 from left to right first
To namely from DOC inlet to the direction of DOC outlet) multiple DOC units for being sequentially arranged, if the total quantity of DOC units is N,
That DOC unit at DOC inlet is the 1st DOC unit, that DOC unit at DOC outlet is n-th DOC units.
Assert that each DOC cell attributes are identical and respective independence, each DOC units are respectively provided with the fuel filler and fuel oil of oneself
Outlet, it is clear that the entrance of next DOC units is also the outlet of upper DOC units, naturally, the inlet temperature of next DOC units
Also it is the outlet temperature of upper DOC units.
2nd, only consider to consider the outlet temperature that radiating condition calculates each DOC units.
With reference to shown in Fig. 2, TdesFor DPF upstreams regeneration temperature setting value, it is approximately equal to the outlet temperature namely N of DOC
The outlet temperature of a DOC units.The inlet temperature of n-th DOC units is the outlet temperature of the N-1 cell.Assuming that DOC
Outlet temperature namely the outlet temperature of n-th DOC units are Tdes, only consider that heat dissipation of each DOC units to environment (can be according to each
Unit radiation parameter calculates), then the inlet temperature of n-th DOC units namely the outlet of the N-1 DOC unit can be extrapolated
Temperature Tdesn-1, then extrapolate the outlet temperature T of the N-2 DOC unitdesn-1, until extrapolating the outlet of the 1st DOC unit
Temperature Tdes1。
Also it is with regard to saying, if only considering the heat dissipation factor of each DOC units, then only when the outlet temperature of the 1st DOC unit
It spends for Tdes1When, it is T that can cause the outlet temperature of the last one namely n-th DOC unitsdesNamely DPF upstreams regeneration
Temperature is Tdes。
3rd, consider the maximum combustion amount and fuel oil conversion capability of each DOC units.
Then, calculating maximum fuel amount that each DOC units can burn (can be according to the corresponding of each DOC units itself
Parameter calculates).
Assuming that it is q that the maximum fuel amount (in unit interval) that the 1st DOC unit can burn, which is calculated,1(even plus
Enter to be more than q1Amount of fuel, the 1st DOC unit can only also burn q1Amount), then q is calculated1Whole combustion heat releases
After the 1st DOC unit outlet temperature can be made to reach Texo1, Texo1Little Yu Tdes1, illustrate that light launches q to DOC1Amount of fuel not
It is enough DOC outlet temperature namely the outlet temperature of the last one DOC unit is made to reach Tdes, DPF upstreams regeneration temperature not up to set
Definite value Tdes, so need to launch more fuel oils.Such as Fig. 3.
Situation one：The amount of fuel (in unit interval) that the 2nd DOC unit, which is calculated, to burn is q2, then calculate
Go out q2The outlet temperature of the 2nd DOC unit can be made to reach T after whole combustion heat releasesexo2If Texo2More than Tdes2, illustrate to
DOC inlet adds in q1+q2Fuel oil and can make DOC outlet temperature namely the last one DOC after the first two unit is all burned
The outlet temperature of unit is more than Tdes, DPF upstreams regeneration temperature is excessive and exceeds setting value Tdes, so need the combustion of reduction DOC
Oily injected volume, at this moment, need to only calculate makes the outlet temperature of the 2nd DOC unit reach Tdes2When, the 2nd DOC unit should
Non-combusted fuels amount q2-.If that is, add in q to DOC1+q2-Amount of fuel, and these fuel oils are in the first two DOC
After unit is completely burned (conversion ratio 100%), it can cause the outlet temperature of the last one DOC unit namely the regeneration of DPF upstreams
Temperature is just Tdes.If each DOC units intermediate fuel oil transformation efficiency is 100%, q is added in the first DOC units1Fuel oil
It measures, then the q1Will in the 1st DOC unit completely burned.But, the fuel oil transformation efficiency of actually each DOC units is basic
It is not possible that reach 100%, but a value less than 1, so we need to add in not less than q into the 1st DOC unit1It removes
With the amount of fuel of the fuel oil transformation efficiency of the 1st DOC unit, it can just ensure that the 1st DOC unit can burn q1Fuel.
Similarly, it is only being added in into the 2nd DOC unit not less than q2-Divided by the fuel oil of the fuel oil transformation efficiency of the 2nd DOC unit
Amount, can just ensure that the 2nd DOC unit can burn q2-Fuel.So under this situation, it would be desirable to DOC inlet plus
Enter q1Divided by amount of fuel+the q of the fuel oil transformation efficiency of the 1st DOC unit2-Divided by the fuel oil transformation efficiency of the 2nd DOC unit
Amount of fuel can just cause DPF upstreams regeneration temperature to be exactly Tdes。
Situation two：The amount of fuel (in unit interval) that the 2nd DOC unit, which is calculated, to burn is q2, then calculate
Go out q2The outlet temperature of the 2nd DOC unit can be made to reach T after whole combustion heat releasesexo2If Texo2Equal to Tdes2, illustrate only
Add in q1+q2Fuel oil and can make DOC outlet temperature namely the last one DOC unit after the first two unit is all burned
Just it is equal to Tdes, DPF upstreams regeneration temperature is exactly Tdes, reach DPF setting target temperatures.Likewise, the conversion effect of fuel oil
Rate is unlikely to be 100%, so we need to add in q at DOC inlet1Divided by the fuel oil transformation efficiency of the 1st DOC unit
Amount of fuel+q2Divided by the amount of fuel of the fuel oil transformation efficiency of the 2nd DOC unit, DPF upstreams regeneration temperature can just be caused to be exactly
Tdes。
Situation three：The amount of fuel (in unit interval) that the 2nd DOC unit, which is calculated, to burn is q2, then calculate
Go out q2The outlet temperature of the 2nd DOC unit can be made to reach T after whole combustion heat releasesexo2If Texo2Equal to Tdes2, illustrate only
Add in q1+q2Fuel oil and after the first two unit is all burned, the outlet of DOC outlet temperature namely the last one DOC unit
Temperature is less than Tdes, so need to continue to increase the fuel oil injected volume at DOC inlet, it is assumed that by calculating, find in n-th of DOC
There is the situation (n=N-1, such as Fig. 4 in this example) of said circumstances one or situation two in unit, then corresponding calculate should be to this preceding n
The sum of practical and then amount of the middle addition of a DOC units, it is fuel quantity (the regeneration nozzle sprayed to DOC inlet that should and be worth
Distributive value).
If it can be appreciated that the unit number of DOC is divided more, then each DOC unit inlets temperature and the temperature of outlet
Difference is just smaller, and the temperature of DOC units is also to influence its heat dissipation performance and the important parameter of maximum fuel quantity combusted, the temperature difference
Smaller, it is more accurate to calculate, so we as much as possible can divide DOC units, the quantity of usual DOC units is preferably not less than
10.And decile divides DOC units, and data of being more convenient for calculate.
Certainly, above-described embodiment is only the technical concepts and features for illustrating the application, and its object is to make people much of that
Solution present context is simultaneously implemented according to this, and the protection domain of the application can not be limited with this.It is all according to the application major technique
The equivalent transformation or modification that the Spirit Essence of scheme is done, should all cover within the protection domain of the application.
Claims (5)
1. a kind of DPF initiative regenerations temprature control method, the DPF are connected to the downstream of DOC, which is characterized in that this method packet
It includes：
Obtain the temperature T at the DOC inletDOCUs, the upstream regeneration temperature desired value of the DPF is actively set as Tdes；
Consider the TDOCUsWith the TdesTemperature difference, calculating makes temperature at the DOC outlet reach TdesWhen, need exist
The amount of fuel added in the DOC；
The fuel oil of corresponding amount is sprayed into the DOC inlet.
2. DPF initiative regenerations temprature control method according to claim 1, which is characterized in that make the DOC in calculating
Outlet temperature reaches TdesWhen, when needing the amount of fuel of addition in the DOC, it is also contemplated that the maximum fuel in the DOC
Amount, the function of environment heat emission amount of transformation efficiency and DOC of the fuel oil in the DOC.
3. DPF initiative regenerations temprature control method according to claim 2, which is characterized in that make the DOC in calculating
Outlet temperature reaches TdesWhen, when needing the amount of fuel of addition in the DOC, the DOC is divided into along fuel oil row
Walk N number of DOC units that direction is sequentially arranged, N >=2；
First, it is assumed that temperature is T at the DOC outletdes, heat dissipation of each DOC units to environment is only considered, by the DOC outlet
Place is to the first outlet temperature for calculating each DOC units at the DOC inlet successively；
Then, the maximum fuel amount that each DOC units can burn is calculated, to extrapolating successively at DOC outlet at DOC inlet
The second outlet temperature of each DOC units after corresponding maximum fuel amount is added under present case to each DOC units；
It, will if reckoning show that the second outlet temperature of x-th of DOC unit is equal with the first outlet temperature of x-th of DOC unit
1st to x-th DOC unit maximum fuels amount is added summation respectively divided by after the fuel oil transfer efficiency of corresponding DOC units, is obtained
And value as temperature at the DOC outlet is made to reach TdesWhen, need the amount of fuel that is added in the DOC；
First outlet temperature of the second outlet temperature of y-th of DOC unit less than y-th of DOC unit is obtained if calculating, and the
The second outlet temperature of y+1 DOC unit is more than the first outlet temperature of the y+1 DOC unit, then calculating makes y+1
The outlet temperature of a DOC units is equal to the combustion that should burn of the first outlet temperature of the y+1 DOC unit, the y+1 DOC unit
Then oil mass will answer non-combusted fuels amount to remove respectively described in the 1st to n-th DOC unit maximum fuels amount, the y+1 DOC unit
To correspond to addition summation after the fuel oil transfer efficiency of DOC units, obtained and value is to reach temperature at the DOC outlet
To TdesWhen, need the amount of fuel that is added in the DOC.
4. DPF initiative regenerations temprature control method according to claim 3, which is characterized in that N >=10.
5. DPF initiative regenerations temprature control method according to claim 3, which is characterized in that described N number of DOC units etc.
Set up separately and put.
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| CN109882274A (en) * | 2019-02-20 | 2019-06-14 | 北京工业大学 | A kind of carbon loading capacity calculation method based on DPF upstream and downstream dynamic temperature change |
| CN111677576A (en) * | 2020-06-30 | 2020-09-18 | 潍柴动力股份有限公司 | Temperature control method and device during DPF regeneration |
| CN112211702A (en) * | 2020-09-25 | 2021-01-12 | 东风商用车有限公司 | Control method and device for DPF active regeneration oil injection system |
| CN112412594A (en) * | 2020-09-23 | 2021-02-26 | 凯龙高科技股份有限公司 | Management control method for regeneration temperature of DPF system of combustor |
| CN112576349A (en) * | 2020-11-25 | 2021-03-30 | 潍柴动力股份有限公司 | Method and device for calculating regenerated fuel injection amount under low-oxygen vehicle condition, storage medium and electronic equipment |
| CN113090367A (en) * | 2021-03-31 | 2021-07-09 | 东风商用车有限公司 | Control method and system for rapidly realizing DPF active regeneration |
| CN114658522A (en) * | 2021-05-27 | 2022-06-24 | 长城汽车股份有限公司 | Method for regenerative control of vehicle engine particle catcher and electronic device |
| CN115891966A (en) * | 2023-02-15 | 2023-04-04 | 潍柴动力股份有限公司 | DPF parking regeneration control method for hybrid electric vehicle and vehicle |
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| CN112576349B (en) * | 2020-11-25 | 2022-08-05 | 潍柴动力股份有限公司 | Method and device for calculating regenerated fuel injection amount under low-oxygen vehicle condition, storage medium and electronic equipment |
| CN112576349A (en) * | 2020-11-25 | 2021-03-30 | 潍柴动力股份有限公司 | Method and device for calculating regenerated fuel injection amount under low-oxygen vehicle condition, storage medium and electronic equipment |
| CN113090367A (en) * | 2021-03-31 | 2021-07-09 | 东风商用车有限公司 | Control method and system for rapidly realizing DPF active regeneration |
| CN113090367B (en) * | 2021-03-31 | 2022-07-05 | 东风商用车有限公司 | Control method and system for rapidly realizing DPF active regeneration |
| CN114658522A (en) * | 2021-05-27 | 2022-06-24 | 长城汽车股份有限公司 | Method for regenerative control of vehicle engine particle catcher and electronic device |
| CN115891966A (en) * | 2023-02-15 | 2023-04-04 | 潍柴动力股份有限公司 | DPF parking regeneration control method for hybrid electric vehicle and vehicle |
| CN115891966B (en) * | 2023-02-15 | 2023-08-18 | 潍柴动力股份有限公司 | DPF parking regeneration control method for hybrid electric vehicle and vehicle |
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